Common Three-square

Schoenoplectus pungens, Cyperaceae

Zones

2–10

Layer

Herbaceous

Lifespan

Perennial

Growth

Fast

Guild Roles

Beneficial Insect HabitatMulch MakerDynamic Accumulator

Growing Conditions

Sun

Full Sun (preferred)Partial Shade (tolerated)

Water

High (established)High (seedling)

Soil pH

6.5 – 8.5

Tolerances

Drought

Frost

Heat

Pest Resistance

Disease Resist.

Companion Plants

Seven-angled PipewortEriocaulon septangulare

Wind ProtectionBeneficial Insect Habitat

American MannagrassGlyceria grandis

Physical SupportBeneficial Insect Habitat

Antagonistic Plants

California BulrushSchoenoplectus californicus

Congeneric bulrush species with similar rhizomatous growth patterns competing for wetland territory

Common Club-rushSchoenoplectus lacustris

Congeneric bulrush species with overlapping habitat preferences and competitive root systems

Needle RushJuncus roemerianus

Dense-forming wetland graminoids competing for space in brackish marshes

Sea ClubrushBolboschoenus maritimus

Related sedges with aggressive rhizome systems competing in brackish wetlands

Uses

Functions

Water FiltrationErosion ControlHabitat CreationSediment Stabilization

Edible Parts

SeedsRoots

Common Questions

What zones does Common Three-square grow in?

Common Three-square grows in USDA hardiness zones 2 through 10.

What are good companion plants for Common Three-square?

Good companions for Common Three-square include Seven-angled Pipewort, American Mannagrass.

Design guilds with Common Three-square and see companion relationships visually.

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